main
# Service specific main multilog directory. 
# if does not start with `/' (but start with alphanumeric!),
# it is relative to $VARSERVICEROOT/$SERVICE/log.
# If starts with `/', considered a full path
#
# Please:
# -- always make the last component called `main'.
# -- if you use absolute path, make the name service 
#    specific with using $SERVICE.  For example
#    /var/log/$SERVICE/main